Google Professional Cloud Network Engineer Exam - Topic 7 Question 89 Discussion

Actual exam question for Google's Professional Cloud Network Engineer exam

Question #: 89
Topic #: 7

[All Professional Cloud Network Engineer Questions]

Your company is planning a migration to Google Kubernetes Engine. Your application team informed you that they require a minimum of 60 Pods per node and a maximum of 100 Pods per node Which Pod per node CIDR range should you use?

A/24

B/25

C/26

D/28

Show Suggested Answer

Suggested Answer: B

To determine the Pod per node CIDR range, you need to calculate how many IP addresses are required for each node, and then choose the smallest CIDR range that can accommodate that number. A CIDR range of /n means that there are 2^(32-n) IP addresses available in that range. For example, a /24 range has 2^(32-24) = 256 IP addresses.

According to the question, the application team requires a minimum of 60 Pods per node and a maximum of 100 Pods per node. Therefore, you need to choose a CIDR range that can provide at least 100 IP addresses per node, but not more than necessary. A /25 range has 2^(32-25) = 128 IP addresses, which is enough for 100 Pods per node. A /26 range has 2^(32-26) = 64 IP addresses, which is not enough for 60 Pods per node. A /24 range has 256 IP addresses, which is more than needed and wastes IP address space. A /28 range has 2^(32-28) = 16 IP addresses, which is far too small for any node.

Therefore, the best option is B. /25.This is also consistent with the Google Kubernetes Engine documentation, which states that each node is allocated a /24 range of IP addresses for Pods by default, but the maximum number of Pods per node is 1101. This means that there are approximately twice as many available IP addresses as possible Pods, which is similar to the ratio of 128 to 100 in the /25 range.

1:Configure maximum Pods per node | Google Kubernetes Engine (GKE) | Google Cloud

by Raul at Aug 03, 2024, 08:53 AM

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Francoise

3 months ago

Agreed, /24 is the safest bet here.

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Leota

3 months ago

No way, /28 won't cut it for 100 Pods!

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Melissa

3 months ago

Surprised they need that many Pods per node! Seems high.

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Loreen

4 months ago

I think /26 should be enough, right?

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Carissa

4 months ago

Definitely need at least /25 for that many Pods.

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Jillian

4 months ago

I’m a bit confused about the maximum of 100 Pods per node. Does that mean we should go for /25? I’m not entirely sure.

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Virgina

4 months ago

I practiced a similar question, and I think /26 provides 64 IPs, which should cover the minimum requirement.

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Leota

4 months ago

I remember something about CIDR ranges, but I can't recall the exact number of usable IPs for each. I feel like /25 might be too much though.

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Glory

5 months ago

I think we need to calculate how many IPs we need for the Pods. If we have a minimum of 60, I’m not sure if /26 gives us enough.

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Nan

5 months ago

I've got a strategy for this. I'll start by calculating the number of IP addresses needed for the Pod count range, then match that to the CIDR options. I think I can nail this one.

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Fidelia

5 months ago

Ah, I see. The key is to find a CIDR range that can accommodate the Pod count requirements. I'm going to work through the options and see which one fits best.

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France

5 months ago

Okay, let's see. They need a minimum of 60 Pods per node and a maximum of 100 Pods per node. I think I know where to start with this.

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Almeta

5 months ago

Hmm, this seems like a tricky one. I'll need to think through the requirements carefully to determine the right CIDR range.

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Anjelica

5 months ago

I'm a bit unsure about this one. The CIDR range options seem pretty close, so I'll need to double-check the math to make sure I get the right answer.

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Ilda

5 months ago

I'm not entirely sure, but I remember something about last touch models focusing on the final interaction before a sale.

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Vanda

1 year ago

I'm feeling pretty confident about this one. Let's see, 60 to 100 Pods per node... I think the /26 CIDR range is the way to go. Gotta love those binary math skills!

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